Detachable knot or fastener for coiled springs



July 17, 192 1,461,895

W. B. FQST ER DETACHABLE KNOT OR FASTENER FOR COILED SPRINGS Filed Nov. 20, 1922 atte WILLIAM B. ros'rna, OFU'IICA, New roan, assrcnoa TO rosrna Bao'rnnns MANp'jrac'rnarne COMPANY, or "orzca, new roan, A coaroaa'rron DETACHABLE KNOT oarasrnnnn non cornnn srnmes.

- Application filed November 20; 1922. Serial No.601,994.

full, clear, and exact description thereof,

which will enable others skilled in the art to which it appertain to make and use the same, reference being had to the accompanying drawings, and to the reference numerals marked thereon, which form part of this specification. My present invention relates to a detach able knot or fastener for coiled springs.

The purpose of my invention isto provide a detachable knot or fastener for coiled springs of novel and improved construction and which is noiseless in use. p

A. further purpose is to provide a detachable fastener which can be readily attached and detached withoutthe u'seof tools and without having to permanently bend" or straighten any of the loops or hooks in the wire forming the coiled spring. 7

torti on A further purpose is to provide a detachable knot the parts of which can be permanently shaped before the tempering process and readily attached without disand after the tempering process has been effected readily attached or detached without distorting the spring or perma nently bending the parts forming the knot.

A further purpose is to provide a coiled spring having a detachable knot of such construction that the end of said knotted spring when detached may be threaded directly through an adjacent coiled spring or through a fastening clip or loop and then theknot readily assembled A still further purpose is to provide a detachable knot particularly well adapted to have'a coil of an adjacent spring connected thereto and stilllie fiat and noiseless.

Further advantages and purposesof this invention will appear from the specification and claims herein.

Fig. 1 is a plan view ofthe top portion of two adjacent and interlocked coiled springs having a detachable fastener or knot embodying my invention.

Fig. 2 is a side elevation of a single coiled. spring having my knot.

formed in the wire and in saidiinnner end 3 is atop viewof the upper-part of said coiled spring with thefknot detached and Fig. 4: is a side view of the spring with a knot detached. 1 i

Fig. 5 is a cross section on line of Fig. 1. a it Referring to the drawings in a more par ticular description, the detachable knot or fastener is shown in connection with the upper end of a coiledspring 7, of the so-called hour-glass type butit will be apparent "from the description and drawings herein that the invention may be applied to both ends of the spring and also may be applied to any. form of spring where the extremity 8 0f the last, or, as shown-in the drawings,

upper coil 9 is spaced slightly out from but on nearly the same horizontal level as the opposite and beginning or inner endlO of said outer or top coil 9. a V

As thewire forming the complete coil spring extends from the body 7 of the spring towards. the last or outer, vandas shown. in the drawings, top coil 9 there is of said top coil 9 an outwardly exte'nding and horizontally arranged U-shaped loop 12. This loop will he of a depth two or three times the diameter of the wire and atter the loop is formed the wire will continue on in aboutflthe same curve to form the outer coil 9. i

At the extremity or outer or tree end 8 of the upper coil 9 there is formed a double hook or S-shaped hook 13 seen inside elevation as in Figs. 2 and 4. The first part 14.- of said hook, that is the part nearest the body of the upper coil 9, extends downwardly, the second part 15 extends'upwardly to about the horizontal plane of the upper coil 9 and then the third and last part 16 extends downwardly.

As ordinarily formed to get a level topped spring and also to have the parts of the knot In assembling the knot the last or outer half of the last coil 9 is temporarily bent or throughconne'cting loops going'to otherthe spring is particularly well,

second aiid'thir'd' portions 15 and 16 of the" S-shaped hook engage the"right-hand leg of the U-shaped'.loop 12 as the parts are" seen in the drawings; then by releasing the upper coil said uppervcoi'l 'springsloackfto normal. assembled position as shown in Fig. 2" w-it-hthefirSt'part M of the S shaped hook-to-{thel'eftpfthe left-hand legof the loop-'mandwith themiddle or se tion 15 of the Ssshaped hook passing-up weirdly-"betweenthetwo legs of the loop l2 and out against the inner surface of the con nesting-part or bottom f the U sha'ped 160p.

.The'kn'ot be're'adily and manually detachedfby reve'rsi'ngthe process justoutlined. It will be seenthaft the knot may be readily attached and detached without the use of tools andfwith'outhaving to bend or permanently distort any part of the spring or ofthe parts of'the" knot. p V

' Both" parts of the "knot; that is" the 8- shaped hook" and the U sha'ped loop are simply a'hdr'elativelyopen, that is free from coinp'lete: loopsor crossing wires and so may be. readily made" by especially connected during the tempering process and so will notxlie distorted by theternpering process and slight variations ih the'form'ol thespring iricident to the tempering process will not affect the assembling or eflicienc'y of the knot A sthe spring-may be readily assembled. or disconnected'andas its" two parts are relatiyely smalland fr'ee'from large projections be threaded onto solid coils of other "springs springs and then have this'knot assembled and so completesthe assembling of a set of springs. 'It Will be seen; moreover; that the knot here described is well'adapted' tb have the wire of a COIl OffiTl adj acent'spring pass glose'to the knot as'is especially shown in' gig: 1.

the regularmcurved .wire' asthe portion 17' l Vhen the springs are so connected of one coiled spring; will pass over or 1 by the wire throughtheknot on the'iother coiled spring of the knotted coil; just to;

hookand then passing to the .right back'of said part- 14 and; over both legs; ofthe 'U- sin'iple machinery; These parts may be readily made after the S shape'd" hookat" the end" or even the" U shap'ed' loop" back therefrom; It will be'seen 1 thatthe partsiof' the knot' niaybe left disadapted to partql'i' passing unden cannot be depressed without depressing the other also. I

What I claimas new andd-esire tosecure by Letters Paten't'is:

15A" detachableknot or fastener 01- a coiled spring comprising an at'the' free end'of the coiled spring arranged at right angles thithepla'n'e of the end coil" of the spring and an'ou'twardly projecting Ell-shaped loop in the end'coil'ot the spring opposite to and detachably engagingsaid s 'shape'd hook. l

2; A" detachable knot or fastener for a coiled springcornpris-ing an S-shaped hook at the endot thecoiled spring; the first part shape'd hook of saidS-shaped hook extending from-the.

plane of the end coil'towards the other end of thespringythe secondpart-returning towards saidplane and the" third part extendingtowards. the other end of the spring and an outwardly projecting iU-shaped loop in the upper coil' of the springopposite to.

and detachably secured to. said S-shaped hook.

3. A' detachable knot 01* fastener for a coiled: spring comprislng an S-shap'edhbok at" the end otthe' coiled spring thefirst part of said S' sha'ped hookexteuding from the plane of the end coil towards the other end of the springgthe secondpart-returit ing towards said plane and'the third part extendin towards the other end of the spring and an outwardly projecting ilshaped'loop iii'the upper" coil of the spring opposite to and detachably secured to said S-shaped hook through said first part of the S-sh aped hook passing'down outside one arm of said U-sh'ape'd loop andfsaid second part of the Sshaped ,hook ascending betweenthe, arrns'ot' said loop and said third part otthe'hoolr paSsingoVer the other arni of said loop and downward therebeyondwfl t. A detachable knotor fastenerfOr a coiled springcomprising-an S*-sh'ap'ed hook at the end of the coiled spring:arranged at, right angles to the plane of the end-coil of the "spring and an outwardly projecting U shaped loop in a previous coil of the springiopposite to and detachably engaging said S-shaped hook. J L

In witness whereof I have affixed my s'i'gnature, this 30th-day of October, 1922.

WILLIAM FOSTER. 

